
class Env {
    constructor(binding) {
        this.binding = binding || {};
    }

}//如果你已经 有一个对象，全局词法环境objEnv
let objEnv = new Env({ name: 'zhufeng' });
objEnv.getValue('name');
let decEnv = new Env();
objEnv.getValue('name');

//rvt